| 12080 | 2f30 | A | Ch1A Water-1 | Ch1A Water-1 | Public Works |
| 12112 | 2f50 | A | Ch2A Water-2 | Ch2A Water-2 | Public Works |
| 12144 | 2f70 | A | Ch3A Safety? | Ch3A Safety | Public Works |
| 12176 | 2f90 | A | Ch4A Sewer-1 | Ch4A Sewer-1 | Public Works |
| 12208 | 2fb0 | A | Ch5A Sewer-2 | Ch5A Sewer-2 | Public Works |
| 12240 | 2fd0 | A | Ch6A Sewer-3 | Ch6A Sewer-3 | Public Works |
| 12272 | 2ff0 | A | Ch7A Fleet | Ch7A Fleet (Fleet Services) | Public Works |
| 12304 | 3010 | A | Ch8A Support | Ch8A Support (Support Services) | Public Works |
| 12336 | 3030 | A | Ch9A Private | Ch9A Private (Car to Car) | Public Works |
| 12368 | 3050 | A | Ch10A Emerge | Ch10A Emergency (Tie to MSP) | Public Works |
| 12400 | 3070 | A | Ch11A Regrou | Ch11A Regroup (OTAR Request Channel) | Public Works |
| 12432 | 3090 | A | Ch12A Deer I | Ch12A Deer Island Project (Special Ops) | Public Works |
| 12464 | 30b0 | A | Ch13A Direct | Ch13A Direct Car to Car (Safety Secondary) | Public Works |
| 12496 | 30d0 | A | Ch14A Nut Is | Ch14A Nut Island Operations | Public Works |
| 12528 | 30f0 | A | Ch15A Deer I | Ch15A Deer Island and Walnut Hill Operations | Public Works |
| 12944 | 3290 | A | ATG All MWRA | ATG (All MWRA Talkgroups 12080-12944) | Public Works |
